IBM Selectric Platen Knob
thingiverse
I purchased an IBM Selectric 1 with a broken platen knob and found that there were no models online of it. The center is 5.6mm and may have to be drilled depending on the material used (I used ABS and it shrunk). 2 m3 heat inserts should be used with m3 set screws to afix it to the platen.
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